/*
 * LensKit, an open-source toolkit for recommender systems.
 * Copyright 2014-2017 LensKit contributors (see CONTRIBUTORS.md)
 * Copyright 2010-2014 Regents of the University of Minnesota
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
package org.lenskit.graph;

import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.Map;

/**
 * A graph node.
 */
class GVNode {
    private final String id;
    private final Map<String,Object> attributes;
    private final String target;

    /**
     * Construct a new graph node.
     * @param id The node ID.
     * @param attrs The node attributes.
     * @param tgt The node target (ID, possibly with port). Used for drawing edges to this
     *            node.
     */
    public GVNode(String id, Map<String, Object> attrs, String tgt) {
        this.id = id;
        attributes = Collections.unmodifiableMap(new LinkedHashMap<>(attrs));
        target = tgt;
    }

    public String getId() {
        return id;
    }

    public Map<String, Object> getAttributes() {
        return attributes;
    }

    public String getTarget() {
        return target;
    }
}
